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5.4 DMZ Host
The DMZ (Demilitarized) host feature allows one local computer to be exposed
to the Internet. Designate a DMZ host when:
• You wish to use a special-purpose Internet service, such as an on-line
game or video-conferencing program, that is not present in the Local servers
list and for which no port range information is available.
• You are not concerned with security and wish to expose one computer to
all services without restriction.
Warning: A DMZ host is not protected by the firewall and may be vulnerable
to attack. Designating a DMZ host may also put other computers in the local
network at risk. When designating a DMZ host, you must consider the security
implications and protect it if necessary.
An incoming request for access to a service in the local network, such as a Web-
server, is fielded by GlobeSurfer 3G. GlobeSurfer 3G will forward this request
to the DMZ host (if one is designated) unless the service is being provided by
another PC in the local network (assigned in Local servers), in which case that
PC will receive the request instead.
• To designate a local computer as a DMZ Host:
1. Select the DMZ Host tab. The DMZ Host screen will appear (see
figure 5.8).
2. Enter the local IP address of the computer that you would like to
designate as a DMZ host. Note that only one LAN computer may
be a DMZ host at any time.
3. Click OK to save your changes and return to the DMZ Host screen.
You may disable the DMZ host so that it will not be fully exposed to the In-
ternet, but keep its IP address recorded on the DMZ Host screen. This may be
useful if you wish to disable the DMZ host but expect that you will want to
enable it again in the future.
• To disable the DMZ host, so that it will not be fully exposed to the Inter-
net: clear the check-box next to the DMZ IP designation.
• To enable the DMZ host: select the check-box next to the DMZ IP desig-
nation.
Figure 5.8: DMZ Host
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